I use Google a lot, but I'm careful to search reputable websites for answers.

The books I have at my fingertips on a daily basis are:

—Chicago Manual of Style

—Strunk & White—The Elements of Style

—The Copyeditor's Handbook

—Webster's Third New International Dictionary

(This dictionary weighs in at over twelve pounds and is almost FOUR inches thick. It was a hundred dollar book I was able to purchase for $25 on Amazon. It is now listed for over $80 with Amazon Prime. I love when I find a bargain.)

What books have you found to help you to learn more to hone your craft of writing?